Given the rarity of epithelioid sarcoma, ‘the possibility exists that this trial will not be completed,’ Division of Oncology 3 acting director Steven Lemery said in recommending approval; confirmatory trial is not expected to complete until 2029, and FDA reviewers suggest it may be underpowered to show an effect on progression-free survival. (Part 2 of our Drug Review Profile on the product.)
The US Food and Drug Administration granted Epizyme Inc.'s Tazverik (tazemetostat) accelerated approval for epithelioid sarcoma despite concerns that the required confirmatory trial may not provide useful information or even be completed.
The study’s design and expected duration, the drug’s availability under accelerated approval, and the rarity of the disease raise questions...